Improvement in hot-air furnaces



Patented April 15, 18?'3.

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Hot-Air Furnaces.

AM. PHorourf/os/Mm/c no. xwoman/w53 mam No. 137,800.A

VU NIT-ED STATES f BENJAMIN c. sAYnE, on MoNTRosE, PENNSYLVANIA.

IMPRovEMi-:NT IN HOT-AIR FuRNAcEs.

,n Specification forming part of Letters Patent No. 137,800, dated April 15, 1873; application led February 15, 1873.

To all whom it may concern: Y

Be it known that I, BENJN. U. SAYRE, of Montrose, in the county of Susquehanna and State of Pennsylvania, have invented a new and Improved Hot-Air Furnace; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawing making part of this specification, in which- Figure 1 is a section taken vertically through the center of the furnace from front to rear. Fig. 2 is a section taken horizontally through the furnace in the plane x Figs. 3 and 4 represent the lire-pot.

Similar letters of reference indicate corresponding parts in the several figures.

This invention relates to improvements of furnaces which are designed forwarmin g buildings with hot air, wherein `I employ a double wall casing, which is made up of horizontal sections connected by perforated rings, and surrounding an air-heating space, the nre-pot, and a drum or combustion-chamber. I also employ, in combination with a double-Wall casing, a double-wall drum or combustionchamber, the space between the walls of which forms a flue for the escape of the products of combustion from the combustion-chamber to `the smoke.- pipe. I also employ a re pot, which is made up of annularsections, which sections can be separated when necessary to substitute a new section for` an old one. I also so construct the two horizontal sections of the casing that they can be turned around, and the relative positions of the feedhole and ashpit door changed, as circumstances require.

The following description of my invention will enable others skilled in the art to understand it.

In the accompanying drawing, A represents' the ash-pit section, with a front door opening, a, leading into it. On this section A is mounted a re-pot, B, which is provided with a grate, C, and composed of three horizontal sections. These sections are connected together by rabbeted joints, which allow any one of them which may be burned out to be removed and a new section substituted. In this way the fire-pot iS easily and cheaply repaired. On top of the tire-pot B is a flanged ring, h, which is connected to the topsection of the series by a rabbeted joint, as shown in Fig. 1. 0n this ring h is supported 'a double-Wall drum, G, between the walls of which is an annular iiueg space, t', which communicates at lc 7c with the interior of the drum G, and near its base with a smoke-pipe, t. The products of combustion will thus circulate between the walls of the drum G on their way from thev fire-pot B to the exit-flue t", thereby highly heating the drum throughout its length. Opposite the pipe t is a feed-passage, h', which extends through the walls of the drum G near its base, and also through the upper section E of the external casing of the furnace. It is through `this passage that fuel is supplied to the firepot. The external casing is composed of two horizontal sections, D and E, and surmounted by a crown, F. These sections are composed of double walls, between which is an annular air-circulating space, s. The bottom section D is mounted on the ash-pit section A, and connected thereto by means of flanges. rIhe top section E is connected to the bottom section by means of a flanged ring, g, which is thickly perforated, as shown at j', for the passage of air. The crown F is connected to the top section by means of a flanged ring, j, through which are perforations o.

AWhen re is made in the fire-pot B, the products of combustion will rise to the top of the drum G, and pass through openings le in- 'to the flue-space fz', between the -two walls ot' this drum; thence descend and escape through the pipe t'. There will thus be a large amount of heat radiated into the annular space P from the outer wall of the drum G, as Well as from the. three sections composing the fire pot. Currents of air will enter the space P through passage c', and the space s through perforations c, and rise to the crown F, where the currents from spaces P and .s will meet, and thence pass oft' to rooms above.

It will be seen that the column of air which rises through the space P is bounded externally by the double-Wall casin g, which is a good non` conductor of heat, and consequently prevents undue radiation of heat from it, while the heat 1which is received by the internal wall of said casing is absorbed by the column of air which rises through the space s, and this air, mixing with the more highly-heated air from the-space PATENT OFFICE.;

"the external wall of the casing.

P over the drum G, will temper the air from the latter space. In this Way I utilize a large amount of heat, which would be radiated from It will also be seen that the flanged ring connection between the' two sections D and E allows the upper section, with its feed-passage and smokepipe, to be turned around and arranged in any position, with respect to the ash-pit door, which may be found necessary or most convenient for superintending the furnace.

Havingdescribed my invention, what Iclaim as new, and desire to secure by Letters Patent, 1s-

1. The double-wall casing, composed of two horizontal sections, D E, connected by a perforated ring, gand combined with a iire-pot, B, and a Hue-drum, G, the section E and drum G being adjustable, substantially as described.

2. The drum G, mounted on the fire-pot B, and composed of double walls with Aa fluespace, z', between them, the inner wall oommunicating through the orifice k with the combastion-chamber, and the outer wall communicating with the escape-nue if, in combination with an external casing, D E, substantially as described.

BENJ N. C. SASTRE.

Witnesses:

Sims PERKINS, HENRY C. TYLER. 

